Haleiwa Trench is a complex site featuring a mix of reef, wall, and artificial reef structures located 200 metres offshore in Oahu. Divers and snorkellers navigate depths ranging from 10 to 27 metres, with an average depth of 18 metres. The site is suited for advanced divers due to strong currents, surf, and potential boat traffic. Marine life observed here includes Spanish Dancer, Spotted Eagle Ray, Snowflake Moray, Turkey Moray, Zebra Moray, Day Octopus, White-spotted Octopus, Tiger Reef Eel, Leaf Scorpionfish, Wrasses, Yellow Tang, Threadfin Butterflyfish, Sea Slug, and Speckled Butterflyfish. Facilities at the shore entry point include parking, toilets, and showers. Night diving is permitted at this location.

Haleiwa Shark Cage is a reef and artificial reef site located off Oahu, United States. This site is suitable for beginners and offers shore access. Divers and snorkellers can expect shallow depths ranging from 1 to 6 metres, with an average of 3 metres. Conditions vary, with mild currents and visibility between 3 and 10 metres. Hazards include surf, surge, sharp coral, sea urchins, and low visibility. Species recorded around this area include various moray eels, nudibranchs, octopus, and reef fish. Facilities at the site include parking, toilets, and showers. Night diving is permitted, and a typical dive lasts 60 minutes.

Waimea Bay on Oahu offers a varied underwater landscape featuring reef, wall, and cave formations. Located 250 metres from the shore, this site is accessible via a shore entry and is suitable for beginners. Divers and snorkellers can expect depths ranging from 7 to 20 metres, with an average of 15 metres. Conditions vary, with visibility between 10 and 35 metres and water temperatures ranging from 24 to 26C. Be aware of potential hazards including strong currents, surge, rip currents, sharp coral, boat traffic, and jellyfish. Facilities at the site include parking, toilets, and showers.

Three Tables is a reef site located in Oahu, Hawaii, suitable for both diving and snorkelling. The site features a shallow depth range of 1 to 7 metres, making it accessible for beginners. Entry is via the shore, and divers can expect mild currents, though visitors should be aware of potential hazards including strong currents and surf. Visibility at the site typically ranges between 10 and 30 metres. Water temperatures remain consistent throughout the year, fluctuating between 24C and 27C. Facilities available at the location include parking and showers.

Shark's Cove in Oahu offers a diverse underwater landscape featuring rocky reefs, caves, and artificial structures. Divers can explore depths ranging from 2 to 20 metres, with an average depth of 12 metres. The site is accessible via a shore entry and is suitable for beginners, though conditions can include surf, rip currents, and strong currents. Visibility typically spans 10 to 35 metres, and water temperatures remain between 23C and 26C throughout the year. Facilities at the site include parking, toilets, and showers. Night diving is permitted, and the site is also suitable for snorkelling.

Haleiwa Trench is a man-made trench created during WWII, now serving as an expansive wall dive on the North Shore of Oahu. Located 100 metres from the shore, this site is suitable for advanced divers due to strong currents and depths ranging from 5 to 27 metres, with an average of 24 metres. Visibility fluctuates between 7 and 25 metres. Divers should be aware of hazards including boat traffic, surf, and the risks associated with deep diving. Species recorded around this area include various moray eels, nudibranchs, octopus, and reef fish such as wrasses and surgeonfish. Shore access is supported by parking, showers, and toilets. Night diving is permitted.

Mākua Beach on Oahu offers a shallow shore dive featuring a mix of reef and seagrass habitats. Divers can explore depths ranging from 2 to 7 metres, with visibility typically between 10 and 30 metres. The site is suitable for newly certified divers, as the underwater conditions are generally manageable with only mild currents. Entry requires caution due to the shore break and surf zone. Protective footwear is recommended to avoid injury from sharp coral and rocks on the seabed. Water temperatures remain consistent throughout the year, ranging from 24 to 27 degrees Celsius.

Yokohama Bay is a shallow reef site on Oahu, Hawaii, suitable for both diving and snorkelling. The site features an average depth of 3 metres, making it accessible for beginners. Entry is via the shore. Marine life recorded at this site includes wrasses, which are occasionally encountered, alongside rarer sightings of Hawaiian Monk Seal, Spanish Dancer, Giant Frogfish, spiny lobster, blue dragon, sea slug, fourspot butterflyfish, banded coral shrimp, spotted boxfish, raccoon butterflyfish, flatworm, Hawaiian convict surgeonfish, and scorpionfish. Water temperatures at this location range between 24C and 27C throughout the year.